Concrete arch and method of constructing.



W. C. FURWY CONCRETE ARCH AND METHOD OF CONSTRUCTING.

Patented Dec 4, 191?;

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APPLICATION FILED JUNE H], 1916- Patented Dee. 4, 119171.

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W. C. FURRY.

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APPLICATION FILED JUNE 19, I916.

Patented Dec. 4, 1917.

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Specification of Letters Patent.

Patented et. a, tort.

Application filed June 19, 11.916. Serial No. rotate.

t and State of Oklahoma, have invented new and useful Improvements in Concrete Arches and Methods of Constructing, of which the following is a specification.

This invention relates to reinforced con-.

crete arches for bridges or culverts and the method and means for erecting such arches. An object of the invention is to form an arch'of a plurality of small precast slabs and to join such slabs. both longitudinally plastic material between suc slabs with reinforcing rods embedded in such concrete filling.

It is a further so form the precast slabs that they will have an interlocklng engagement with the concrete filling. A further object is to provide improved centering plates for supporting the slabs and filling which can be re ily ret moved after the concrete has set.

The above and other features of advantages and capabilities will become apparent from a detail description of the accompanying drawings, in which T'have illustrated one form of my invention, but the construa' tion there shown is to be understood as illustrative only.

Referring to the drawings Figure 1 illustrates a concrete arch'partly in section, embodying one form of my invention.

Fig 2 is an enlarged sectional view of the recast slabs, concrete filling and the adustable centering plates for supporting the slabs and filling.

Fig. 3 an enlarged perspective view of one of the slabs. o I

Fig. 4 is a side elevational view of the arch shown in Fig. l, with the adjustable centering plates in position.

Fig. 5 is an enlarged elevational view of apart of the adjustable centering plates. Fig. 6 is a cross-sectional view of one of the centering plates, and

Fig. 7 is-a plan view of the same.

'The arch is made up of a plurallty of arch rings 10, each ring comprising a plurality of slabs 11, which slabs, are at their top transverse surface spaced apart and proand transversely bya-fillin of concrete or object ofthe invention to vided in their transverse edgeswith depressions or grooves 12, as best shown-in Fig. t, the bottom transverse edges of said slabs bemg so formed and positioned asto tightly engage one another to retain the concrete filling. .ln the space thus'formed between the transverse edges of said slabs the concrete filling is poured, which binds the slabs together in a transverse direction and if desired, a reinforcing rod 13 may be embedded in such filling.

The arch rings 10, which maybe of any ltd desired number, are also spaced apart, as

best shown in Figs. 1 and 2 and are supported on a series of centerings, each centering comprising a plurality of adjustable centering plates 14,'hereinafter more fully described. lln the space between the arch rings a concrete filling 15 is poured, in which filling are embedded two pair of rods, one

pair being below the slabs and the other above. Of course it is understood that the number of reinforcing rods maybe varied as desired, except it is desirable, in order to get the bestresults, that the rods should be placed both below and above the slabs, partlcularly below. The slabs comprised in the arch rings are formed near their lower edges with inwardly curved corners 16, so

as to secure a better support on the concrete filling l5, and, at the same time, allow the concrete to easily find its way down under the edges of the lower surface of these slabs when being poured, that is, when the centering plates shown with upwardly extending sides are utilized. Of course 1t will be understood that other forms of centering plates may be used where the concrete filling is not extended below the lower surfaces of the slabs.

Referring now to the centerings shown,

- each centering comprises a plurality of centering plates 14, which are formed of sheet metal or other similar material and are provided with upwardly extending sides 17, to

which sides are secured sheet metal ll-shaped plates 18, which plates are pivotally con-- nected one with another by any suitable means, such, for example, as the bolt shown. The opposite or apex ends of the plates lid are connected in pairs'by transverse rod 19,

and each pair is adjustably connected onellt ltd

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with another by means of the arms 20, which arms areapivotally connected at one end to the rOdS 19 near the apex of the plates 18 on the outside thereof and at their opposite ends are provided with an opening designed to receive a pin 21. Each of the plates 18 is provided near its center with a plurality of openings adapted to receive the pin 21, for

securing the arm 20 in place and adjusting the curvature or position of the centering plates 14. The arms 20 not only serve as adjusting means through the medium of the pin and slot connection with the plates 18, but also serve as bracing members so that when the complete arc is formed the centering plates 14, through the medium of the plates 18 and arms 20 are self-supporting and do not require an auxiliary or supplemental centering frame. It will be readily seen that the centering plates 14 may be adjusted to various arcs or forms.

In building the construction illustrated, av plurality of centerings are set up and spaced apart about two feet, the number of centerings depending, of course, on the width of the arch. After this is done the precast slab comprised in each arch ring are placed in position, on the centering plates, resting on the sides 17, and having their ends extended over, substantially as shown in Figs. 1 and 2, so as to leave a space between each arch ring, the bottom transverse edges of the slabs, in each arch ring being tightly engaged one with another With their upper transverse edges spaced apart. By having the lower transverse edges of the slabs thus tightly engaged, the slabs not only support the transverse filling, but also tend to be self-supporting and thus relieve the centering of considerable weight. After theslabs have been thus arranged, the

lower pair of reinforcing rods are positioned in the centering plates between the arch rings, as shown in Figs. 1 and 2, the transverse rods 13 are then placed transversely of the arch and between the slabs, the concrete or filling is then poured in the spaces between the slabs and arch rings even with the upper surface of the slabs, then the forms for the upper portion of the filling between the arch rings are positioned as shown in Fig. 2, the upper pair of bars placed and the concrete or filling then I poured to form the upper portion of the filling between the arch rings; if desired, how

ever, the upper portion may be eliminated, but it is desirable that this be utilized, as it affords a more substantial construction and serves to better bind the sections together.

I claim:

1. The method of constructing culvert arches of precast slabs consisting in lacing a plurality of arch rib centerings ad ustable to various curves at a distance from each other, then placing a suficient number of precast slabs thereon to form an arch of predetermined length and curve, then pouring concrete between the ends of said slabs embedding them wholly or partially in the arch ribs thus formed, then permitting the concrete to harden and subsequently removing the arch rib centerings.

2. The method of constructing a continuous concrete culvert arch consisting of placing in substantial alinement and spaced apart from each other a plurality of arch rib centerings each of which is adjustable to various predetermined curves, then so placing a suflicient number of precast slabs on adjacent rib centerings to form a series of arches spaced apart from each other at their ends, then pouring concrete between the slabs in each arch and on to the rib centerings, embedding the ends of the precast slabs wholly or partially in the arch ribs thus formed, then allowing the poured concrete to harden for maintaining the various parts of the structure thus formed in permanent relation relative to each other, then removing the arch rib centerings.

3. The method of constructing a continuous concrete culvert arch consisting of placing in substantial alinement and spaced apart from each other a plurality of adjustable arch rib centerings, each of which comprises a plurality of mold sections hinged together, with means for maintaining these sections in variou positions of adjustment, and each of which has a bottom member with two upwardly extending flanges forming the mold, then so placing a suiticient number of precast slabs on the upturned flanges of adjacent rib centerings and slightly overlapping the ame to form a series of arches spaced apart from each other at their ends, then pouring concrete between the slabs in each arch and on to the rib centerings, wholly or partially embedding the ends of each' arch in the concrete ribs thus formed, then allowing the poured concrete to harden for securely and permanently maintaining the arches in proper position relative to ea h other, then partially collapsing and removing the rib centerings.

4. A continuous concrete arch culvert comprising a series of arch rings spaced apart, each ring comprising a plurality of precast slabs and subsequently cast arch, concrete ribs wholly or partially embedding the ends of said rings for supporting and permanently holding them in position relative to each other.

5. A continuous concrete arch culvert comprising a series of arch rings spaced apart, each ring comprising a plurality of precast slabs having grooved sides to form a channel between the upper edges of said slabs when placed in position, concrete fillintents cast arch concrete ribs wholly or partially embedding the adjacent ends of said arch rings for upporting and permanently holding them in position relative to each other.

6. A continuous concrete arch culvert comprising a series of arch rings spaced apart, each ring comprising a plurality of precast slabs, concrete filling between side edges of said slabs, and subsequently cast arch concrete ribs wholly or partially surrounding the ends of said arch rings for supporting and permanently holding them in position relative to each other substantially as shown and described.

In witness whereof, hereunto subscribe my name to this specification in the presence of two witnesses.

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Witnesses:

J. D. Lyman, WM. M. 15mm. 

